Not so much a "game" per se, but Boxcar2D generates a vehicle out of random shapes and wheels, and runs timed trials on them. The best of that batch becomes the seed for the next trials, where the game makes mutations of it and tries them out. The best of that batch goes on to the next trial, and so on, and it's neat watching the evolution of your vehicle. I've been letting mine run for a while today and it's up to 739 for distance.

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That reminds me of an old Flash game where you made a vector-based pseudo-biological automaton monstrosity that fumbled its way around a course to a goal or something. The evolution angle is very cool, however.

I'd be interested to know more about how it works. Does it "breed" the vehicles at all, or does it keep starting chains iterating on the best car yet?